Merge branch 'vm' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

[~andy/linux] / arch / alpha / kernel / srmcons.c

diff --git a/arch/alpha/kernel/srmcons.c b/arch/alpha/kernel/srmcons.c
index f1fdf178bcb4cc0658376f3b5668b66ce1b520f3..3ea809430eda0f3ea018df2b540a75614846ce05 100644 (file)
--- a/arch/alpha/kernel/srmcons.c
+++ b/arch/alpha/kernel/srmcons.c
@@ -30,10 +30,9 @@ static int srm_is_registered_console = 0;
 #define MAX_SRM_CONSOLE_DEVICES 1      /* only support 1 console device */
 
 struct srmcons_private {
-       struct tty_struct *tty;
+       struct tty_port port;
        struct timer_list timer;
-       spinlock_t lock;
-};
+} srmcons_singleton;
 
 typedef union _srmcons_result {
        struct {
@@ -68,20 +67,21 @@ static void
 srmcons_receive_chars(unsigned long data)
 {
        struct srmcons_private *srmconsp = (struct srmcons_private *)data;
+       struct tty_port *port = &srmconsp->port;
        unsigned long flags;
        int incr = 10;
 
        local_irq_save(flags);
        if (spin_trylock(&srmcons_callback_lock)) {
-               if (!srmcons_do_receive_chars(srmconsp->tty))
+               if (!srmcons_do_receive_chars(port->tty))
                        incr = 100;
                spin_unlock(&srmcons_callback_lock);
        } 
 
-       spin_lock(&srmconsp->lock);
-       if (srmconsp->tty)
+       spin_lock(&port->lock);
+       if (port->tty)
                mod_timer(&srmconsp->timer, jiffies + incr);
-       spin_unlock(&srmconsp->lock);
+       spin_unlock(&port->lock);
 
        local_irq_restore(flags);
 }
@@ -153,55 +153,23 @@ srmcons_chars_in_buffer(struct tty_struct *tty)
        return 0;
 }
 
-static int
-srmcons_get_private_struct(struct srmcons_private **ps)
-{
-       static struct srmcons_private *srmconsp = NULL;
-       static DEFINE_SPINLOCK(srmconsp_lock);
-       unsigned long flags;
-       int retval = 0;
-
-       if (srmconsp == NULL) {
-               srmconsp = kmalloc(sizeof(*srmconsp), GFP_KERNEL);
-               spin_lock_irqsave(&srmconsp_lock, flags);
-
-               if (srmconsp == NULL)
-                       retval = -ENOMEM;
-               else {
-                       srmconsp->tty = NULL;
-                       spin_lock_init(&srmconsp->lock);
-                       setup_timer(&srmconsp->timer, srmcons_receive_chars,
-                                       (unsigned long)srmconsp);
-               }
-
-               spin_unlock_irqrestore(&srmconsp_lock, flags);
-       }
-
-       *ps = srmconsp;
-       return retval;
-}
-
 static int
 srmcons_open(struct tty_struct *tty, struct file *filp)
 {
-       struct srmcons_private *srmconsp;
+       struct srmcons_private *srmconsp = &srmcons_singleton;
+       struct tty_port *port = &srmconsp->port;
        unsigned long flags;
-       int retval;
-
-       retval = srmcons_get_private_struct(&srmconsp);
-       if (retval)
-               return retval;
 
-       spin_lock_irqsave(&srmconsp->lock, flags);
+       spin_lock_irqsave(&port->lock, flags);
 
-       if (!srmconsp->tty) {
+       if (!port->tty) {
                tty->driver_data = srmconsp;
-
-               srmconsp->tty = tty;
+               tty->port = port;
+               port->tty = tty; /* XXX proper refcounting */
                mod_timer(&srmconsp->timer, jiffies + 10);
        }
 
-       spin_unlock_irqrestore(&srmconsp->lock, flags);
+       spin_unlock_irqrestore(&port->lock, flags);
 
        return 0;
 }
@@ -210,16 +178,17 @@ static void
 srmcons_close(struct tty_struct *tty, struct file *filp)
 {
        struct srmcons_private *srmconsp = tty->driver_data;
+       struct tty_port *port = &srmconsp->port;
        unsigned long flags;
 
-       spin_lock_irqsave(&srmconsp->lock, flags);
+       spin_lock_irqsave(&port->lock, flags);
 
        if (tty->count == 1) {
-               srmconsp->tty = NULL;
+               port->tty = NULL;
                del_timer(&srmconsp->timer);
        }
 
-       spin_unlock_irqrestore(&srmconsp->lock, flags);
+       spin_unlock_irqrestore(&port->lock, flags);
 }
 
 
@@ -236,6 +205,9 @@ static const struct tty_operations srmcons_ops = {
 static int __init
 srmcons_init(void)
 {
+       tty_port_init(&srmcons_singleton.port);
+       setup_timer(&srmcons_singleton.timer, srmcons_receive_chars,
+                       (unsigned long)&srmcons_singleton);
        if (srm_is_registered_console) {
                struct tty_driver *driver;
                int err;